En una rifa se tienen los boletos del 1 al 20. Dados los eventos A = boletos pares, B = boletos impares, C = múltiplos de 2, calcula: a) A ∪ B =

b) A ∪ C =

answer: 8d

step-by-step explanation:

45+5= 50+5=55+5=60

x=3y-6

step-by-step explanation:

solve for   x by simplifying both sides of the equation, then isolating the variable.

the figure is a concave pentagon.

step-by-step explanation:

in mathematical context, a pentagon is a flat, two-dimensional closed shape (polygon) with 5 straight sides and 5 angles.

now a pentagon is said to be concave if one or more corners bend inwards and at least one of its angles is 180 degrees or more than 180 degrees.

in the given figure, we can see that we have a corner which is bending inwards and an angle which is clearly greater than 180°. therefore, it is a concave pentagon.